Magnetorotational instability driven dynamos at low magnetic Prandtl numbers

Show full item record



Permalink

http://hdl.handle.net/10138/28863

Citation

Käpylä , P J & Mantere , M 2011 , ' Magnetorotational instability driven dynamos at low magnetic Prandtl numbers ' , Monthly Notices of the Royal Astronomical Society , vol. 413 , pp. 901-907 . https://doi.org/10.1111/j.1365-2966.2010.18184.x

Title: Magnetorotational instability driven dynamos at low magnetic Prandtl numbers
Author: Käpylä, Petri J.; Mantere, Maarit
Contributor organization: Department of Physics
Date: 2011
Language: eng
Number of pages: 7
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
DOI: https://doi.org/10.1111/j.1365-2966.2010.18184.x
URI: http://hdl.handle.net/10138/28863
Abstract: Numerical simulations of the magnetorotational instability (MRI) with zero initial net flux in a non-stratified isothermal cubic domain are used to demonstrate the importance of magnetic boundary conditions. In fully periodic systems the level of turbulence generated by the MRI strongly decreases as the magnetic Prandtl number (Pm), which is the ratio of kinematic viscosity and magnetic diffusion, is decreased. No MRI or dynamo action below Pm=1 is found, agreeing with earlier investigations. Using vertical field conditions, which allow magnetic helicity fluxes out of the system, the MRI is found to be excited in the range 0.1
Description: 7 pages, 7 figures, submitted to MNRAS. Version with higher resolution figures is available at http://www.helsinki.fi/~kapyla/publ.html
Subject: astro-ph.HE
astro-ph.SR
115 Astronomy, Space science
Peer reviewed: Yes
Usage restriction: restrictedAccess


Files in this item

Total number of downloads: Loading...

Files Size Format View
1004.2417v1 511.4Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record